Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual foi o salário anual mínimo de Casey Martin?
 ###Tabelas: CREATE TABLE support_of_leading_parties_and_blocs_by_administrative_regions (support_of_leading_parties_and_blocs_by_administrative_regions_id AUTO_INCREMENT PRIMARY KEY, Region VARCHAR, Voter registration INT, Voter turnout INT, BYuT INT, OU-PSD INT) CREATE TABLE gost_7.67-94 (gost_7.67-94_id AUTO_INCREMENT PRIMARY KEY, Country name VARCHAR, Russian name VARCHAR, Cyrillic code VARCHAR, Latin 3-letter code VARCHAR, Latin 2-letter code VARCHAR, Numeric code INT) CREATE TABLE pga_tour_results (pga_tour_results_id AUTO_INCREMENT PRIMARY KEY, Year INT, Tournaments played INT, Cuts made INT, Wins INT, Best finish VARCHAR, Earnings ( $ ) INT, Money list rank VARCHAR) CREATE TABLE north-east (north-east_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Faith VARCHAR, Type VARCHAR, DCSF number INT, Ofsted number INT) CREATE TABLE "sandy_bridge_dual-core"_32_nm ("sandy_bridge_dual-core"_32_nm_id AUTO_INCREMENT PRIMARY KEY, Model number VARCHAR, sSpec number VARCHAR, Cores VARCHAR, Frequency VARCHAR, Turbo VARCHAR, L2 cache VARCHAR, L3 cache VARCHAR, GPU model VARCHAR, GPU frequency VARCHAR, Socket VARCHAR, I/O bus VARCHAR, Release date VARCHAR, Part number(s) VARCHAR, Release price ( USD ) VARCHAR)  
SELECT MIN Earnings ( $ ) FROM pga_tour_results